CAJ | 학술논문

针对建筑群外埋地燃气管道穿孔泄漏问题，利用Gambit2．4建立三维仿真模型，并运用CFD软件Fluent14．0分别对不同环境温度、湿度条件下，燃气在土壤和大气中的连续泄漏扩散工况进行了数值模拟。对比分析了环境温度、相对湿度耦合作用下对燃气扩散的影响及浓度分布规律。研究结果表明，从泄漏口喷出的燃气首先在土壤层中迅速扩散，致使上方地表附近的浓度值很快达到了爆炸下限和上限。透过地表的燃气遇到两侧建筑物时，在迎风侧和背风侧方向分别形成不同的浓度扩散区域。受不同湿度和温度的影响，部分建筑物表面的预警浓度所处高度发生了明显的变化。案例研究结果可评估燃气泄漏事故的范围大小和指导人员及时有效地疏散。
침대건축군외매지연기관도천공설루문제，이용Gambit2．4건립삼유방진모형，병운용CFD연건Fluent14．0분별대불동배경온도、습도조건하，연기재토양화대기중적련속설루확산공황진행료수치모의。대비분석료배경온도、상대습도우합작용하대연기확산적영향급농도분포규률。연구결과표명，종설루구분출적연기수선재토양층중신속확산，치사상방지표부근적농도치흔쾌체도료폭작하한화상한。투과지표적연기우도량측건축물시，재영풍측화배풍측방향분별형성불동적농도확산구역。수불동습도화온도적영향，부분건축물표면적예경농도소처고도발생료명현적변화。안례연구결과가평고연기설루사고적범위대소화지도인원급시유효지소산。
In view of the problem of buried gas pipeline piercing leakage outside the buildings ,a three‐dimensional simulation model was established with Gambit2 .4 .The continuous leak diffusion circumstance of gas in soil and atmosphere were carried out through numerical modeling by CFD soft‐ware Fluent 14 .0 under different ambient temperature and humidity .The influence factor of gas dif‐fusion and the distribution regularity of concentration were comparatively analyzed under the coupling effect of ambient temperature and relative humidity .The research result showed that the gas ejecting from the leakage mouth first spread rapidly in the soil layer ,resulting in the concentration of the up‐per surface quickly reaching the lower explosive limit and upper explosive limit .As the gas permea‐ting through the earth surface ,it influenced both sides of the building .Different concentration diffu‐sion regions also formed on the windward side and the leeward side direction .Affected by different humidity and temperature ,for some buildings ,the warning concentration on the height of surface changed obviously .T he case study results could assess the scope of the gas leak accident and effective‐ly evacuate the masses in time .